Originally Posted by BiMoPed
The 48cc has a 40 mm piston and bore
The 66 cc has a 47 mm piston and bore
therefore they have the same stroke
I think there is still two different stroke lengths floating around. I had re jugged the bigger of the two engines before piston wise and came up with having to shim a jug to get the piston to clear the top and make the ports work. Meaning that there was a short stroke version out there? I nick named my motor a stroker motor after that lol.